我创建了一个内部框架，主要包含一个 jlist 和一个 jtable。
我要做的是，当用户在 jList 中选择一个政党或一组政党时，该表应包含一个包含所选政党名称的列并将其添加到 jTable 中。 Default jTable
我所实现的将初始 tableModel 存储在一个对象中，每次用户在 jList 选择中进行更改时，它都会首先将表模型更改为存储的对象，然后根据新的选择进行更改。 Table After First Selection
问题是定义的 jTable1.setModel() 方法不起作用。 Errorunous table after Second Selection
PS:未使用的代码已删除。问题仅包含导致错误的代码段。完整文件可见:Here
import javax.swing.event.ListSelectionEvent;
import javax.swing.event.ListSelectionListener;
import javax.swing.table.DefaultTableModel;
import javax.swing.table.TableModel;
public class DispatchPlanningSelfContained extends javax.swing.JFrame {
DefaultTableModel defaultdtm;
public DispatchPlanningSelfContained() {
initComponents();
defaultdtm = (DefaultTableModel) jTable1.getModel();
jList1.addListSelectionListener(new ListSelectionListener() {
@Override
public void valueChanged(ListSelectionEvent e) {
if(!e.getValueIsAdjusting()){
//I use either of below method each time
jTable1.setModel((TableModel)defaultdtm);// This Doesn't set the tablemodel to default one (I expect this to set the table as Image 1)
jTable1.setModel(defaultdtm);// This too Doesn't set the tablemodel to default one
DefaultTableModel dtm = (DefaultTableModel) jTable1.getModel();
int selection[] = jList1.getSelectedIndices();
System.out.println("Selection Length = " + selection.length);
for(int i = 0; i < selection.length; i++){
dtm.addColumn(jList1.getModel().getElementAt(selection[i]));
System.out.println("selection [" + i + "] = " + jList1.getModel().getElementAt(selection[i]));
}
}
}
});
}
@SuppressWarnings("unchecked")
// <editor-fold defaultstate="collapsed" desc="Generated Code">//GEN-BEGIN:initComponents
private void initComponents() {
jLabel4 = new javax.swing.JLabel();
jScrollPane3 = new javax.swing.JScrollPane();
jList1 = new javax.swing.JList<>();
jLabel5 = new javax.swing.JLabel();
jScrollPane2 = new javax.swing.JScrollPane();
jTable1 = new javax.swing.JTable();
setDefaultCloseOperation(javax.swing.WindowConstants.EXIT_ON_CLOSE);
jLabel4.setText("Pending Party Names");
jList1.setModel(new javax.swing.AbstractListModel<String>() {
String[] strings = { "Party 1", "Party 2", "Party 3", "Party 4", "Party 5", "Party 6", "Party 7", "Party 8", "Party 9" };
public int getSize() { return strings.length; }
public String getElementAt(int i) { return strings[i]; }
});
jScrollPane3.setViewportView(jList1);
jLabel5.setText("Planning Results:");
jTable1.setAutoCreateRowSorter(true);
jTable1.setModel(new javax.swing.table.DefaultTableModel(
new Object [][] {
},
new String [] {
"Code", "Description", "Rulling", "Page", "MRP", "QPC", "Total Order", "Stock", "Shortage"
}
));
jScrollPane2.setViewportView(jTable1);
javax.swing.GroupLayout layout = new javax.swing.GroupLayout(getContentPane());
getContentPane().setLayout(layout);
layout.setHorizontalGroup(
layout.createParallelGroup(javax.swing.GroupLayout.Alignment.LEADING)
.addGap(0, 967, Short.MAX_VALUE)
.addGroup(layout.createParallelGroup(javax.swing.GroupLayout.Alignment.LEADING)
.addGroup(layout.createSequentialGroup()
.addContainerGap()
.addGroup(layout.createParallelGroup(javax.swing.GroupLayout.Alignment.LEADING)
.addComponent(jScrollPane2)
.addGroup(layout.createSequentialGroup()
.addGroup(layout.createParallelGroup(javax.swing.GroupLayout.Alignment.LEADING)
.addGroup(layout.createSequentialGroup()
.addGap(268, 268, 268)
.addComponent(jLabel4))
.addComponent(jLabel5))
.addPreferredGap(javax.swing.LayoutStyle.ComponentPlacement.RELATED)
.addComponent(jScrollPane3, javax.swing.GroupLayout.PREFERRED_SIZE, 531, javax.swing.GroupLayout.PREFERRED_SIZE)
.addPreferredGap(javax.swing.LayoutStyle.ComponentPlacement.RELATED, 52, Short.MAX_VALUE)))
.addContainerGap()))
);
layout.setVerticalGroup(
layout.createParallelGroup(javax.swing.GroupLayout.Alignment.LEADING)
.addGap(0, 585, Short.MAX_VALUE)
.addGroup(layout.createParallelGroup(javax.swing.GroupLayout.Alignment.LEADING)
.addGroup(layout.createSequentialGroup()
.addContainerGap()
.addGroup(layout.createParallelGroup(javax.swing.GroupLayout.Alignment.LEADING)
.addGroup(layout.createSequentialGroup()
.addComponent(jLabel4)
.addGap(96, 96, 96)
.addComponent(jLabel5))
.addComponent(jScrollPane3, javax.swing.GroupLayout.PREFERRED_SIZE, javax.swing.GroupLayout.DEFAULT_SIZE, javax.swing.GroupLayout.PREFERRED_SIZE))
.addPreferredGap(javax.swing.LayoutStyle.ComponentPlacement.RELATED, javax.swing.GroupLayout.DEFAULT_SIZE, Short.MAX_VALUE)
.addComponent(jScrollPane2, javax.swing.GroupLayout.PREFERRED_SIZE, javax.swing.GroupLayout.DEFAULT_SIZE, javax.swing.GroupLayout.PREFERRED_SIZE)
.addContainerGap()))
);
pack();
}// </editor-fold>//GEN-END:initComponents
public static void main(String args[]) {
java.awt.EventQueue.invokeLater(new Runnable() {
public void run() {
new DispatchPlanningSelfContained().setVisible(true);
}
});
}
// Variables declaration - do not modify//GEN-BEGIN:variables
private javax.swing.JLabel jLabel4;
private javax.swing.JLabel jLabel5;
private javax.swing.JList<String> jList1;
private javax.swing.JScrollPane jScrollPane2;
private javax.swing.JScrollPane jScrollPane3;
private javax.swing.JTable jTable1;
// End of variables declaration//GEN-END:variables
}
最佳答案
问题从这里开始，其背后的假设是:
DefaultTableModel dtm = (DefaultTableModel) jTable1.getModel();
代码似乎将 dtm 视为初始表模型的副本，而现在它只是引用它。
最简单的修复方法是在每次更改时使用原始数据初始化表模型:
import javax.swing.*;
import javax.swing.event.*;
import javax.swing.table.*;
public class DispatchPlanningSelfContained extends JFrame {
Object[][] data = new Object[][]{};
String[] titles = {
"Code", "Description", "Rulling", "Page",
"MRP", "QPC", "Total Order", "Stock", "Shortage"
};
public DispatchPlanningSelfContained() {
initComponents();
jList1.addListSelectionListener((ListSelectionEvent e) -> {
if (!e.getValueIsAdjusting()) {
DefaultTableModel dtm = new DefaultTableModel(data, titles);
int selection[] = jList1.getSelectedIndices();
System.out.println("Selection Length = " + selection.length);
for (int i = 0; i < selection.length; i++) {
dtm.addColumn(jList1.getModel().getElementAt(selection[i]));
System.out.println("selection [" + i + "] = " +
jList1.getModel().getElementAt(selection[i]));
}
jTable1.setModel(dtm);
}
});
}
@SuppressWarnings("unchecked")
private void initComponents() {
jLabel4 = new JLabel();
jScrollPane3 = new JScrollPane();
jList1 = new JList<>();
jLabel5 = new JLabel();
jScrollPane2 = new JScrollPane();
jTable1 = new JTable();
setDefaultCloseOperation(WindowConstants.EXIT_ON_CLOSE);
jLabel4.setText("Pending Party Names");
jList1.setModel(new AbstractListModel<String>() {
String[] strings = {
"Party 1", "Party 2", "Party 3", "Party 4",
"Party 5", "Party 6", "Party 7", "Party 8", "Party 9"
};
@Override
public int getSize() {
return strings.length;
}
@Override
public String getElementAt(int i) {
return strings[i];
}
});
jScrollPane3.setViewportView(jList1);
jLabel5.setText("Planning Results:");
jTable1.setAutoCreateRowSorter(true);
jTable1.setModel(new DefaultTableModel(data, titles));
jScrollPane2.setViewportView(jTable1);
GroupLayout layout = new GroupLayout(getContentPane());
getContentPane().setLayout(layout);
layout.setHorizontalGroup(
layout.createParallelGroup(GroupLayout.Alignment.LEADING)
.addGap(0, 967, Short.MAX_VALUE)
.addGroup(layout.createParallelGroup(GroupLayout.Alignment.LEADING)
.addGroup(layout.createSequentialGroup()
.addContainerGap()
.addGroup(layout.createParallelGroup(GroupLayout.Alignment.LEADING)
.addComponent(jScrollPane2)
.addGroup(layout.createSequentialGroup()
.addGroup(layout.createParallelGroup(GroupLayout.Alignment.LEADING)
.addGroup(layout.createSequentialGroup()
.addGap(268, 268, 268)
.addComponent(jLabel4))
.addComponent(jLabel5))
.addPreferredGap(LayoutStyle.ComponentPlacement.RELATED)
.addComponent(jScrollPane3, GroupLayout.PREFERRED_SIZE, 531, GroupLayout.PREFERRED_SIZE)
.addPreferredGap(LayoutStyle.ComponentPlacement.RELATED, 52, Short.MAX_VALUE)))
.addContainerGap()))
);
layout.setVerticalGroup(
layout.createParallelGroup(GroupLayout.Alignment.LEADING)
.addGap(0, 585, Short.MAX_VALUE)
.addGroup(layout.createParallelGroup(GroupLayout.Alignment.LEADING)
.addGroup(layout.createSequentialGroup()
.addContainerGap()
.addGroup(layout.createParallelGroup(GroupLayout.Alignment.LEADING)
.addGroup(layout.createSequentialGroup()
.addComponent(jLabel4)
.addGap(96, 96, 96)
.addComponent(jLabel5))
.addComponent(jScrollPane3, GroupLayout.PREFERRED_SIZE, GroupLayout.DEFAULT_SIZE, GroupLayout.PREFERRED_SIZE))
.addPreferredGap(LayoutStyle.ComponentPlacement.RELATED, GroupLayout.DEFAULT_SIZE, Short.MAX_VALUE)
.addComponent(jScrollPane2, GroupLayout.PREFERRED_SIZE, GroupLayout.DEFAULT_SIZE, GroupLayout.PREFERRED_SIZE)
.addContainerGap()))
);
pack();
}// </editor-fold>//GEN-END:initComponents
public static void main(String args[]) {
java.awt.EventQueue.invokeLater(() -> {
new DispatchPlanningSelfContained().setVisible(true);
});
}
// Variables declaration - do not modify//GEN-BEGIN:variables
private JLabel jLabel4;
private JLabel jLabel5;
private JList<String> jList1;
private JScrollPane jScrollPane2;
private JScrollPane jScrollPane3;
private JTable jTable1;
// End of variables declaration//GEN-END:variables
}
关于java - jTable.setModel() 未按预期工作，我们在Stack Overflow上找到一个类似的问题： https://stackoverflow.com/questions/60954857/